Zero flow fireproof quick disconnect coupling

In a quick disconnect coupling, for supplying fluid from a pressure source to a pressure receiver without leakage, said coupling being comprised of a coupler assembly and a nipple assembly adapted to be operatively interconnected by an operator;

• said female member including:
• i. a first, generally tubular housing having a first longitudinal through bore;
• ii. a generally cylindrical support member having one portion thereof affixed to and surrounding a longitudinal portion of said housing;
• iii. a hollow sleeve member, normally biased to a first position, located within a longitudinal portion of said first housing through bore;
• iv. a first sealing assembly, including a first seal member, for sealing said sleeve member, relative to said first housing, said first sealing assembly being located in a first recess extending into said first housing bore;
• v. a stop assembly, including a generally tubular member having one end affixed within said first bore and extending through said sleeve member, said stop assembly also having another end, said another end incorporating a peripheral seal member for sealing said another end, relative to an adjacent portion of said sleeve member, when at said first position;
• vi. an actuating sleeve, normally biased to a second position, surrounding said support member, said actuating sleeve being adapted for axial movement, by an operator, in a direction opposite said second position;
• with said nipple assembly including:
• vii. a second, generally tubular housing having a longitudinal second through bore;
• viii. a longitudinally movable poppet, located within said second through bore, normally biased to a third position;
• ix. a second sealing assembly, including a second seal member, for sealing said poppet, relative to said second through bore and said sleeve member, said second sealing assembly being located in a second recess extending into said second housing bore;
• wherein an improvement comprises in combination:
• a. each of said first and second recesses for said respective first and second sealing assemblies, including a first end wall, angled relative to the longitudinal extents of said housings, with each of said first and second seal members taking the form of an elastomeric toroidal sealing member and being located adjacent to second end walls, in said housing recesses, longitudinally spaced from said first end walls;
• b. each of said first and second sealing assemblies further including:
• i. a non-continuous metallic first backup ring, of a generally triangular shape, in a radial plane passing through the longitudinal axis of said assemblies, with a base surface thereof serving as the internal peripheral surface thereof, and a first angled side thereof being complementary with the first end walls of each of said sealing recesses;
• ii. a non-metallic second backup ring, of generally truncated triangular shape, in a radial plane passing through the longitudinal axis of said assemblies, with a base surface thereof serving as the outer peripheral surface thereof, and a third angled side thereof being complementary with a second angled side of said first backup ring, while a fourth angled side of said second backup ring is complementary with the side of said toroidal sealing member that is opposite to the side thereof that abuts each of said recess first end walls;
• and
• c. a metallic insulating sleeve, surrounding said actuating sleeve while being substantially fully radially spaced therefrom, via a substantially continuous peripheral insulating air gap, except for a band portion, at one end of said insulating, sleeve, with said band portion being press-fitted on a corresponding portion of said actuating sleeve, in a manner so as to provide a plurality of further separate longitudinally extending insulating air gaps.